| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/audio/mac/scoped_audio_unit.h" |
| |
| #include "base/mac/mac_logging.h" |
| |
| namespace media { |
| |
| constexpr AudioComponentDescription desc = {kAudioUnitType_Output, |
| kAudioUnitSubType_HALOutput, |
| kAudioUnitManufacturer_Apple, 0, 0}; |
| |
| static void DestroyAudioUnit(AudioUnit audio_unit) { |
| OSStatus result = AudioUnitUninitialize(audio_unit); |
| OSSTATUS_DLOG_IF(ERROR, result != noErr, result) |
| << "AudioUnitUninitialize() failed : " << audio_unit; |
| result = AudioComponentInstanceDispose(audio_unit); |
| OSSTATUS_DLOG_IF(ERROR, result != noErr, result) |
| << "AudioComponentInstanceDispose() failed : " << audio_unit; |
| } |
| |
| ScopedAudioUnit::ScopedAudioUnit(AudioDeviceID device, AUElement element) { |
| AudioComponent comp = AudioComponentFindNext(0, &desc); |
| if (!comp) |
| return; |
| |
| AudioUnit audio_unit; |
| OSStatus result = AudioComponentInstanceNew(comp, &audio_unit); |
| if (result != noErr) { |
| OSSTATUS_DLOG(ERROR, result) << "AudioComponentInstanceNew() failed."; |
| return; |
| } |
| |
| const UInt32 enable_input_io = element == AUElement::INPUT ? 1 : 0; |
| result = AudioUnitSetProperty(audio_unit, kAudioOutputUnitProperty_EnableIO, |
| kAudioUnitScope_Input, AUElement::INPUT, |
| &enable_input_io, sizeof(enable_input_io)); |
| if (result != noErr) { |
| OSSTATUS_DLOG(ERROR, result) |
| << "Failed to set input enable IO for audio unit."; |
| DestroyAudioUnit(audio_unit); |
| return; |
| } |
| |
| const UInt32 enable_output_io = !enable_input_io; |
| result = AudioUnitSetProperty(audio_unit, kAudioOutputUnitProperty_EnableIO, |
| kAudioUnitScope_Output, AUElement::OUTPUT, |
| &enable_output_io, sizeof(enable_output_io)); |
| if (result != noErr) { |
| OSSTATUS_DLOG(ERROR, result) |
| << "Failed to set output enable IO for audio unit."; |
| DestroyAudioUnit(audio_unit); |
| return; |
| } |
| |
| result = AudioUnitSetProperty( |
| audio_unit, kAudioOutputUnitProperty_CurrentDevice, |
| kAudioUnitScope_Global, 0, &device, sizeof(AudioDeviceID)); |
| if (result != noErr) { |
| OSSTATUS_DLOG(ERROR, result) |
| << "Failed to set current device for audio unit."; |
| DestroyAudioUnit(audio_unit); |
| return; |
| } |
| |
| audio_unit_ = audio_unit; |
| } |
| |
| ScopedAudioUnit::~ScopedAudioUnit() { |
| if (audio_unit_) |
| DestroyAudioUnit(audio_unit_); |
| } |
| |
| } // namespace media |